mcs/class/System.XML/System.Xml.XPath/XPathNodeIterator.cs

   1 //
   2 // System.Xml.XPath.XPathNodeIterator
   3 //
   4 // Author:
   5 //   Jason Diamond (jason@injektilo.org)
   6 //
   7 // (C) 2002 Jason Diamond  http://injektilo.org/
   8 //
   9
  10 using System;
  11
  12 namespace System.Xml.XPath
  13 {
  14         public abstract class XPathNodeIterator : ICloneable
  15         {
  16                 private int _count = -1;
  17
  18                 #region Constructor
  19
  20                 protected XPathNodeIterator ()
  21                 {
  22                 }
  23
  24                 #endregion
  25
  26                 #region Properties
  27
  28                 public virtual int Count
  29                 {
  30                         get
  31                         {
  32                                 if (_count == -1)
  33                                 {
  34                                         // compute and cache the count
  35                                         XPathNodeIterator tmp = Clone ();
  36                                         while (tmp.MoveNext ())
  37                                                 ;
  38                                         _count = tmp.CurrentPosition;
  39                                 }
  40                                 return _count;
  41                         }
  42                 }
  43
  44                 public abstract XPathNavigator Current { get; }
  45
  46                 public abstract int CurrentPosition { get; }
  47
  48                 #endregion
  49
  50                 #region Methods
  51
  52                 public abstract XPathNodeIterator Clone ();
  53
  54                 object ICloneable.Clone ()
  55                 {
  56                         return Clone ();
  57                 }
  58
  59                 public abstract bool MoveNext ();
  60
  61                 #endregion
  62         }
  63 }